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Biblioteca

MARC Lista (tabellare)
Asterisk : the future of telephony / Jim Van Meggelen, Leif Madsen, and Jared Smith
Asterisk : the future of telephony / Jim Van Meggelen, Leif Madsen, and Jared Smith
Autore Meggelen, Jim Van
Edizione [2nd ed.]
Pubbl/distr/stampa Beijing : O'Reilly, c2007
Descrizione fisica xxv, 574 p. : ill. ; 24 cm
Disciplina 004.695
Altri autori (Persone) Madsen, Leifauthor
Smith, Jared
Soggetto topico Internet telephony
ISBN 9780596510480
0596510489
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Record Nr. UNISALENTO-991001896409707536
Meggelen, Jim Van  
Beijing : O'Reilly, c2007
Materiale a stampa
Lo trovi qui: Univ. del Salento
Opac: Controlla la disponibilità qui
Asterisk : il mondo VoIP open source / Diego Gosmar ...[et al. ]
Asterisk : il mondo VoIP open source / Diego Gosmar ...[et al. ]
Pubbl/distr/stampa Milano : Apogeo, c2008
Descrizione fisica xvi, 296 p. : ill. ; 24 cm
Disciplina 004.695
Altri autori (Persone) Gosmar, Diegoauthor
Innamorato, Giuseppe
Osler, Stefano
Osler, Dimitri
Collana Guida completa
Soggetto topico Internet telephony
ISBN 9788850327423
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione ita
Record Nr. UNISALENTO-991000350559707536
Milano : Apogeo, c2008
Materiale a stampa
Lo trovi qui: Univ. del Salento
Opac: Controlla la disponibilità qui
Asterisk 1.4 [[electronic resource] ] : the professional's guide : implementing, administering, and consulting on commercial IP telephony solutions / / Colman Carpenter ... [et al.]
Asterisk 1.4 [[electronic resource] ] : the professional's guide : implementing, administering, and consulting on commercial IP telephony solutions / / Colman Carpenter ... [et al.]
Autore Carpenter Colman
Pubbl/distr/stampa Birmingham, U.K., : Packt Publishing Ltd., c2009
Descrizione fisica vii, 262 p. : ill
Disciplina 004.69/5
Collana From technologies to solutions
Soggetto topico Internet telephony
Soggetto genere / forma Electronic books.
ISBN 1-282-25738-2
9786612257384
1-84719-439-7
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Record Nr. UNINA-9910455590603321
Carpenter Colman  
Birmingham, U.K., : Packt Publishing Ltd., c2009
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Asterisk 1.4 [[electronic resource] ] : the professional's guide : implementing, administering, and consulting on commercial IP telephony solutions / / Colman Carpenter ... [et al.]
Asterisk 1.4 [[electronic resource] ] : the professional's guide : implementing, administering, and consulting on commercial IP telephony solutions / / Colman Carpenter ... [et al.]
Autore Carpenter Colman
Pubbl/distr/stampa Birmingham, U.K., : Packt Publishing Ltd., c2009
Descrizione fisica vii, 262 p. : ill
Disciplina 004.69/5
Collana From technologies to solutions
Soggetto topico Internet telephony
ISBN 1-282-25738-2
9786612257384
1-84719-439-7
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Record Nr. UNINA-9910780405503321
Carpenter Colman  
Birmingham, U.K., : Packt Publishing Ltd., c2009
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Asterisk 1.4 : the professional's guide : implementing, administering, and consulting on commercial IP telephony solutions / / Colman Carpenter ... [et al.]
Asterisk 1.4 : the professional's guide : implementing, administering, and consulting on commercial IP telephony solutions / / Colman Carpenter ... [et al.]
Autore Carpenter Colman
Edizione [1st ed.]
Pubbl/distr/stampa Birmingham, U.K., : Packt Publishing Ltd., c2009
Descrizione fisica vii, 262 p. : ill
Disciplina 004.69/5
Collana From technologies to solutions
Soggetto topico Internet telephony
ISBN 1-282-25738-2
9786612257384
1-84719-439-7
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Intro -- Asterisk 1.4 -- Table of Contents -- Asterisk 1.4 -- Credits -- Foreword -- About the Authors -- About the Reviewers -- Preface -- Reviewing the basics -- No compromise -- What this book covers -- Onwards -- Conventions -- Reader feedback -- Customer support -- Downloading the example code for the book -- Errata -- Piracy -- Questions -- 1. The Dialplan -- Dialplan location -- Extensions and contexts -- Pattern matching -- Why use contexts? -- Call barring made simple -- Time and day call routing -- Variables -- Inheritance of channel variables through the dialplan -- Using the AstDB -- Dialplan features and additions -- func_devstate -- What can we use the DEVSTATE() function for? -- Outgoing trunk selection -- Calling extensions -- Setting lights -- Boosting outgoing call capacity -- Using multiple broadband lines -- Configuration overview -- Setting up the routing in Linux -- Configuring Asterisk -- Explanation of the macro -- Downsides -- System() application -- Summary -- 2. Network Considerations when Implementing Asterisk -- Centralized and distributed installations -- Centralized installations -- Distributed solutions -- Latency and jitter -- Jitterbuffer -- Echo -- Do your homework -- SLAs are for everyone -- Achieving the goal -- Backups -- To share or not to share -- Ensuring quality -- When things go wrong -- Red -- Amber -- Green -- Increasing resilience -- Summary -- 3. Call Routing with Asterisk -- Routing methods -- Where to start -- Internal calls -- Local calls -- National calls -- International calls -- Alternative options -- ENUM -- DUNDi -- Types of routing -- Routing techniques -- Summary -- 4. Call Centers-Queues and Recording -- Asterisk queues -- Queue gotchas -- A practical queue -- Using queues to cascade calls -- Call recording-the issues -- Show-stoppers -- VoIP recording approaches.
Impact of VoIP on recording systems -- Hardware convergence -- Distributed call centers -- Home working -- VoIP recording challenges -- Routing -- Bandwidth -- Encryption -- Solutions -- Asterisk call center solutions -- How VICIDIAL works -- Handling inbound calls -- Installation -- Timing sources -- Scalability -- Summary -- 5. Asterisk and Speech Technology -- Why speech-enable? -- Types of speech technologies -- Automatic Speech Recognition (ASR) -- Isolated Word Recognition -- Connected Word Recognition -- Natural Language Recognition -- Text-to-Speech (TTS) -- Speaker Verification and Identification (SVI) -- MRCP -- Implementation considerations -- ASR and Asterisk -- Installing LumenVox speech recognition with Asterisk -- Checking that things are working -- SpeechCreate() -- SpeechLoadGrammar (yesno,/etc/lumenvox/Lang/BuiltinGrammars/ABNFBoolean.gram) -- SpeechActivateGrammar(yesno) -- SpeechBackground(beep) -- Verbose(1,Result was {SPEECH_TEXT(0)}) -- Verbose(1,Confidence was {SPEECH_SCORE(0)}) -- SpeechStart() -- SpeechDeactivateGrammar(label) -- SpeechUnloadGrammar(label) -- SpeechDestroy() -- {SPEECH(results)} -- Grammar files -- Implementation advice for ASR -- TTS with Asterisk -- Implementation advice for TTS -- Summary -- 6. Call Accounting and Billing -- Call Data Records (CDRs) -- CDR frontends -- Call accounting -- Providing termination billing -- Every little helps -- Selecting a billing platform -- Introducing A2Billing -- Reasons to consider A2Billing -- A2Billing requirements -- Monitoring usage -- Coding for A2Billing -- Billing gotcha! -- High call volumes -- Other high-call-volume solutions -- SER/OpenSER -- FreeSWITCH -- Summary -- 7. Resilience and Stability -- Increasing availability -- Stability -- Network -- Cables -- Switches and routers -- Endpoints -- Telephony switches and gateways -- Server -- Environment.
Dealing with failure -- Network resilience -- Server -- High availability -- Ultra Monkey -- Telephony switches/gateways -- Redfone foneBRIDGE2 -- Junghanns ISDNguard -- Endpoints -- Round robin DNS -- Say hello to Rsync -- Limiting the number of calls per server -- Summary -- 8. Localization and Practical Security -- Tones -- Time and date and localization -- Changing the language of system prompts -- Local telephony interfaces -- Analog -- Digital -- Localizing caller ID signaling on Digium analog interfaces -- Checklist -- Practical security -- Out of hours -- Summary -- 9. Interfacing with Traditional Analog and Digital Telephony -- Analog -- Digital -- ISDN BRI (Basic Rate Interface) -- ISDN PRI (Primary Rate Interface) -- Choices, choices -- Using external adaptors -- Using cards -- Installing a Digium card -- Card installation-physical -- Installing the DAHDI software -- Configuring the DAHDI files to enable the card -- What about the other cards? -- framing -- coding -- Troubleshooting with Digium cards -- Summary -- 10. Integrating Asterisk with Wireless Technologies -- Why integrate Asterisk with wireless technologies? -- Wireless technology overview -- Wi-Fi (only) phones -- SIP desk phones with a wireless link -- Dual-mode (GSM and SIP) phones and PDA/smart phones -- SIP/DECT phones -- Connecting Asterisk to mobile networks -- Why connect to mobile networks? -- The GSM gateway (box) -- The GSM card -- Configuring wireless devices -- Configuring Asterisk to work with wireless technologies -- Deployment choices -- Neat money saving tricks -- Calling a mobile phone -- Avoiding those nasty roaming charges that arise from receiving calls -- Summary -- 11. Graphical User Interfaces -- Reasons for going GUI -- Good to GUI -- Ease of administration -- Access to enhanced features -- Easier upgrade process -- Standardized code -- GUI, phooey!.
Performance -- Stability -- Restricted functions -- FreePBX -- How it works -- Installation -- Configuration -- Extensions -- Inbound routes -- Outbound routes -- Trunks -- Other records -- Summary -- A. Selling Your Solution -- In the beginning ... -- Drivers for changing phone systems -- A word on cost -- Generating interest -- Alliances -- Advertising -- Search engines -- Become an expert -- Relationship marketing -- Email as a marketing tool -- Tracking prospects -- Converting the prospect into a sale -- Determining your customer's hardware requirements -- Choosing the right phones -- Tales of woe -- Aastra -- Linksys -- Siemens Gigaset IP DECT phones -- Snom M3 -- Remote support -- Make it secure -- Do's and don'ts -- The do's -- First impressions -- Get brochures printed -- Take notes -- Send the quote in a timely manner -- Follow up the quote -- Target the decision makers, but don't ignore IT -- The don'ts -- You don't need a fancy office -- Don't cut corners on the solution -- Don't under price -- Don't have a huge margin on handsets -- Don't supply a PC as the phone server -- Summary -- B. Sample Email Content -- What is VoIP? -- Why should I consider VoIP? -- Cost savings -- Call costs -- Line rental costs -- Wiring costs -- Reduced infrastructure costs -- Centralized management -- System integration -- Unified messaging -- Reliability -- Closed and open systems -- Superior sound -- Fallback solutions -- Broadcasting calls -- A number for life -- Number porting -- Local numbers -- About XYZ -- Our philosophy -- Our passion -- C. Sample Appointment Sheet -- Index.
Record Nr. UNINA-9910811216203321
Carpenter Colman  
Birmingham, U.K., : Packt Publishing Ltd., c2009
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Asterisk 1.6 [[electronic resource] ] : build feature-rich telephony systems with Asterisk / / David Merel, Barrie Dempster, David Gomillion
Asterisk 1.6 [[electronic resource] ] : build feature-rich telephony systems with Asterisk / / David Merel, Barrie Dempster, David Gomillion
Autore Merel David
Pubbl/distr/stampa Birmingham, U.K., : Packt Pub., 2009
Descrizione fisica 1 online resource (240 p.)
Disciplina 004.695
Altri autori (Persone) DempsterBarrie
GomillionDavid
Collana From technologies to solutions
Soggetto topico Internet telephony
Soggetto genere / forma Electronic books.
ISBN 1-282-30501-8
9786612305016
1-84719-863-5
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Cover; Table of Contents; Preface; Chapter 1: Introduction to Asterisk; What is Asterisk?; What's new in Asterisk 1.4; What's new in Asterisk 1.6; Asterisk is a PBX; Extension-to-Extension calls; Line trunking; Telco features; Advanced Call Distribution; Call Detail Records; Call recording; Call parking; Call barging; Asterisk is an IVR system; Asterisk is a call center system; Asterisk is a voicemail system; Asterisk is a Voice over IP (VoIP) system; Asterisk 1-2-3; Asterisk scalability; Asterisk does not run on Windows; Is Asterisk a good fit for me?; Trade-offs
Flexibility versus ease of useGraphical versus configuration file management; Calculating total cost of ownership; Return on Investment; Summary; Chapter 2: Making a Plan for Deployment; The Public Switched Telephony Network (PSTN); Connection methods; Plain Old Telephone Service (POTS) line; Integrated Services Digital Network (ISDN); T1 or E1; Voice over IP connections; Determining our needs; Terminal equipment; Types of terminal devices; Hard phones; Soft phones; Analog adapters; Another PBX; Choosing a device; Features, features, and more features...; Determining true cost
Compatibility with AsteriskSound quality analysis; Usability issues; Recording decisions; How much hardware do I need?; Choosing the extension length; Preparing a test environment; Summary; Chapter 3: Installing Asterisk; Preparing to install Asterisk; Obtaining the source files; Installing DAHDI; Installing LibPRI (optional); Installing Asterisk; Getting to know Asterisk; Summary; Chapter 4: Configuring Asterisk; DAHDI interfaces; system.conf; Lines; Terminals; chan_dahdi.conf; Lines; Terminals; SIP interfaces; IAX interfaces; Voicemail; Music on hold; Queues; Conference rooms; Summary
Chapter 5: Creating a DialplanCreating a context; Creating an extension; Creating outgoing extensions; Advanced Call Distribution; Call queues; Call parking; Direct Inward Dialing (DID); Automated attendants; System services; Summary; Chapter 6: Quality Assurance; Call Detail Records; Flat-file CDR logging; Database CDR logging; Monitoring calls; Recording calls; Legal concerns; Summary; Chapter 7: Making Asterisk Easy to Manage; Trixbox; CentOS; Trixbox preparation and installation; What is FreePBX?; FreePBX preparation and installation; FreePBX System Status Dashboard; Tools; Setup
Trixbox maintenance sectionReports; Asterisk Recording Interface; Flash Operator Panel (FOP); Flash operator configuration files; Web MeetMe; Setting up and accessing Web MeetMe through Trixbox; Flexibility when needed; A simple one-to-one PBX; Extensions; Trunks; Routes; Summary; Chapter 8: What is asterCRM?; Installing asterCRM; Automatic installation; Manual installation; Introducing asterCRM; Import; Statistic; Extension; Customer; Dialer; System; Survey; Summary; Chapter 9: Case Studies; Small office/home office; The scenario; The discussion; The configuration; system.conf
chan_dahdi.conf
Record Nr. UNINA-9910456633603321
Merel David  
Birmingham, U.K., : Packt Pub., 2009
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Asterisk 1.6 [[electronic resource] ] : build feature-rich telephony systems with Asterisk / / David Merel, Barrie Dempster, David Gomillion
Asterisk 1.6 [[electronic resource] ] : build feature-rich telephony systems with Asterisk / / David Merel, Barrie Dempster, David Gomillion
Autore Merel David
Pubbl/distr/stampa Birmingham, U.K., : Packt Pub., 2009
Descrizione fisica 1 online resource (240 p.)
Disciplina 004.695
Altri autori (Persone) DempsterBarrie
GomillionDavid
Collana From technologies to solutions
Soggetto topico Internet telephony
ISBN 1-282-30501-8
9786612305016
1-84719-863-5
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Cover; Table of Contents; Preface; Chapter 1: Introduction to Asterisk; What is Asterisk?; What's new in Asterisk 1.4; What's new in Asterisk 1.6; Asterisk is a PBX; Extension-to-Extension calls; Line trunking; Telco features; Advanced Call Distribution; Call Detail Records; Call recording; Call parking; Call barging; Asterisk is an IVR system; Asterisk is a call center system; Asterisk is a voicemail system; Asterisk is a Voice over IP (VoIP) system; Asterisk 1-2-3; Asterisk scalability; Asterisk does not run on Windows; Is Asterisk a good fit for me?; Trade-offs
Flexibility versus ease of useGraphical versus configuration file management; Calculating total cost of ownership; Return on Investment; Summary; Chapter 2: Making a Plan for Deployment; The Public Switched Telephony Network (PSTN); Connection methods; Plain Old Telephone Service (POTS) line; Integrated Services Digital Network (ISDN); T1 or E1; Voice over IP connections; Determining our needs; Terminal equipment; Types of terminal devices; Hard phones; Soft phones; Analog adapters; Another PBX; Choosing a device; Features, features, and more features...; Determining true cost
Compatibility with AsteriskSound quality analysis; Usability issues; Recording decisions; How much hardware do I need?; Choosing the extension length; Preparing a test environment; Summary; Chapter 3: Installing Asterisk; Preparing to install Asterisk; Obtaining the source files; Installing DAHDI; Installing LibPRI (optional); Installing Asterisk; Getting to know Asterisk; Summary; Chapter 4: Configuring Asterisk; DAHDI interfaces; system.conf; Lines; Terminals; chan_dahdi.conf; Lines; Terminals; SIP interfaces; IAX interfaces; Voicemail; Music on hold; Queues; Conference rooms; Summary
Chapter 5: Creating a DialplanCreating a context; Creating an extension; Creating outgoing extensions; Advanced Call Distribution; Call queues; Call parking; Direct Inward Dialing (DID); Automated attendants; System services; Summary; Chapter 6: Quality Assurance; Call Detail Records; Flat-file CDR logging; Database CDR logging; Monitoring calls; Recording calls; Legal concerns; Summary; Chapter 7: Making Asterisk Easy to Manage; Trixbox; CentOS; Trixbox preparation and installation; What is FreePBX?; FreePBX preparation and installation; FreePBX System Status Dashboard; Tools; Setup
Trixbox maintenance sectionReports; Asterisk Recording Interface; Flash Operator Panel (FOP); Flash operator configuration files; Web MeetMe; Setting up and accessing Web MeetMe through Trixbox; Flexibility when needed; A simple one-to-one PBX; Extensions; Trunks; Routes; Summary; Chapter 8: What is asterCRM?; Installing asterCRM; Automatic installation; Manual installation; Introducing asterCRM; Import; Statistic; Extension; Customer; Dialer; System; Survey; Summary; Chapter 9: Case Studies; Small office/home office; The scenario; The discussion; The configuration; system.conf
chan_dahdi.conf
Record Nr. UNINA-9910780787903321
Merel David  
Birmingham, U.K., : Packt Pub., 2009
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Asterisk 1.6 : build feature-rich telephony systems with Asterisk / / David Merel, Barrie Dempster, David Gomillion
Asterisk 1.6 : build feature-rich telephony systems with Asterisk / / David Merel, Barrie Dempster, David Gomillion
Autore Merel David
Edizione [1st ed.]
Pubbl/distr/stampa Birmingham, U.K., : Packt Pub., 2009
Descrizione fisica 1 online resource (240 p.)
Disciplina 004.695
Altri autori (Persone) DempsterBarrie
GomillionDavid
Collana From technologies to solutions
Soggetto topico Internet telephony
ISBN 1-282-30501-8
9786612305016
1-84719-863-5
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Cover; Table of Contents; Preface; Chapter 1: Introduction to Asterisk; What is Asterisk?; What's new in Asterisk 1.4; What's new in Asterisk 1.6; Asterisk is a PBX; Extension-to-Extension calls; Line trunking; Telco features; Advanced Call Distribution; Call Detail Records; Call recording; Call parking; Call barging; Asterisk is an IVR system; Asterisk is a call center system; Asterisk is a voicemail system; Asterisk is a Voice over IP (VoIP) system; Asterisk 1-2-3; Asterisk scalability; Asterisk does not run on Windows; Is Asterisk a good fit for me?; Trade-offs
Flexibility versus ease of useGraphical versus configuration file management; Calculating total cost of ownership; Return on Investment; Summary; Chapter 2: Making a Plan for Deployment; The Public Switched Telephony Network (PSTN); Connection methods; Plain Old Telephone Service (POTS) line; Integrated Services Digital Network (ISDN); T1 or E1; Voice over IP connections; Determining our needs; Terminal equipment; Types of terminal devices; Hard phones; Soft phones; Analog adapters; Another PBX; Choosing a device; Features, features, and more features...; Determining true cost
Compatibility with AsteriskSound quality analysis; Usability issues; Recording decisions; How much hardware do I need?; Choosing the extension length; Preparing a test environment; Summary; Chapter 3: Installing Asterisk; Preparing to install Asterisk; Obtaining the source files; Installing DAHDI; Installing LibPRI (optional); Installing Asterisk; Getting to know Asterisk; Summary; Chapter 4: Configuring Asterisk; DAHDI interfaces; system.conf; Lines; Terminals; chan_dahdi.conf; Lines; Terminals; SIP interfaces; IAX interfaces; Voicemail; Music on hold; Queues; Conference rooms; Summary
Chapter 5: Creating a DialplanCreating a context; Creating an extension; Creating outgoing extensions; Advanced Call Distribution; Call queues; Call parking; Direct Inward Dialing (DID); Automated attendants; System services; Summary; Chapter 6: Quality Assurance; Call Detail Records; Flat-file CDR logging; Database CDR logging; Monitoring calls; Recording calls; Legal concerns; Summary; Chapter 7: Making Asterisk Easy to Manage; Trixbox; CentOS; Trixbox preparation and installation; What is FreePBX?; FreePBX preparation and installation; FreePBX System Status Dashboard; Tools; Setup
Trixbox maintenance sectionReports; Asterisk Recording Interface; Flash Operator Panel (FOP); Flash operator configuration files; Web MeetMe; Setting up and accessing Web MeetMe through Trixbox; Flexibility when needed; A simple one-to-one PBX; Extensions; Trunks; Routes; Summary; Chapter 8: What is asterCRM?; Installing asterCRM; Automatic installation; Manual installation; Introducing asterCRM; Import; Statistic; Extension; Customer; Dialer; System; Survey; Summary; Chapter 9: Case Studies; Small office/home office; The scenario; The discussion; The configuration; system.conf
chan_dahdi.conf
Record Nr. UNINA-9910827844103321
Merel David  
Birmingham, U.K., : Packt Pub., 2009
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Asterisk hacking : toolkit and liveCD / Benjamin Jackson, Champ Clark III ; Larry Chaffin and Johnny Long, technical editors
Asterisk hacking : toolkit and liveCD / Benjamin Jackson, Champ Clark III ; Larry Chaffin and Johnny Long, technical editors
Autore Jackson, Benjamin
Pubbl/distr/stampa Burlington, MA : Syngress, c2007
Descrizione fisica xii, 253 p. : ill. ; 24 cm. + 1 CD-ROM
Disciplina 004.695
Altri autori (Persone) Clark, Champ, III.author
Soggetto topico Internet telephony
ISBN 9781597491518
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Record Nr. UNISALENTO-991001896339707536
Jackson, Benjamin  
Burlington, MA : Syngress, c2007
Materiale a stampa
Lo trovi qui: Univ. del Salento
Opac: Controlla la disponibilità qui
Beyond VoIP protocols [[electronic resource] ] : understanding voice technology and networking techniques for IP telephony / / Olivier Hersent, Jean-Pierre Petit, and David Gurle
Beyond VoIP protocols [[electronic resource] ] : understanding voice technology and networking techniques for IP telephony / / Olivier Hersent, Jean-Pierre Petit, and David Gurle
Autore Hersent Olivier
Pubbl/distr/stampa Hoboken, NJ, : John Wiley, 2005
Descrizione fisica 1 online resource (285 p.)
Disciplina 004.62
621.385
Altri autori (Persone) PetitJean-Pierre
GurleDavid
Soggetto topico Internet telephony
Speech processing systems
ISBN 1-280-27632-0
9786610276325
0-470-02364-3
0-470-02363-5
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Beyond VoIP Protocols Understanding Voice Technology and Networking Techniques for IP Telephony; Contents; Glossary; List of Abbreviations; 1 Introduction; 1.1 The rebirth of VoIP; 1.2 Why beyond VoIP protocols?; 1.2.1 Selecting a voice coder; 1.2.2 Providing 'toll quality' . . . and more; 1.2.3 Controlling IP quality of service; 1.2.4 Dimensioning the network; 1.2.5 Unleashing the potential of multicast; 1.3 Scope of this book; 1.4 Intended audience; 1.5 Conclusion; 1.6 References; 2 Introduction to Speech-coding Techniques; 2.1 A primer on digital signal processing; 2.1.1 Introduction
2.1.2 Sampling and quantization2.1.3 The sampling theorem; 2.1.4 Quantization; 2.1.5 ITU G.711 A-law or μ-law, a basic coder at 64 kbit/s; 2.2 The basic tools of digital signal processing; 2.2.1 Why digital technology simplifies signal processing; 2.2.2 The Z transform and the transfer function; 2.2.3 Linear prediction for speech-coding schemes; 2.3 Overview of speech signals; 2.3.1 Narrow-band and wide-band encoding of audio signals; 2.3.2 Speech production: voiced, unvoiced, and plosive sounds; 2.3.3 A basic LPC vocoder: DOD LPC 10
2.3.4 Auditory perception used for speech and audio bitrate reduction2.4 Advanced voice coder algorithms; 2.4.1 Adaptive quantizers. NICAM and ADPCM coders; 2.4.2 Differential predictive quantization; 2.4.3 Long-term prediction for speech signal; 2.4.4 Vector quantization; 2.4.5 Entropy coding; 2.5 Waveform coders. ADPCM ITU-T G.726; 2.5.1 Coder specification . . . from digital test sequences to C code; 2.5.2 Embedded version of the G.726 ADPCM coder G.727; 2.5.3 Wide-band speech coding using a waveform-type coder; 2.6 Hybrids and analysis by synthesis (ABS) speech coders; 2.6.1 Principle
2.6.2 The GSM full-rate RPE-LTP speech coder (GSM 06.10)2.7 Codebook-excited linear predictive (CELP) coders; 2.7.1 ITU-T 8-kbit/s CS-ACELP G.729; 2.7.2 ITU-T G.723.1: dual-rate speech coder for multimedia communications transmitting at 5.3 kbit/s and 6.3 kbit/s; 2.7.3 The low-delay CELP coding scheme: ITU-T G.728; 2.7.4 The AMR and AMR-WB coders; 2.8 Quality of speech coders; 2.8.1 Speech quality assessment; 2.8.2 ACR subjective test, mean opinion score (MOS); 2.8.3 Other methods of assessing speech quality; 2.8.4 Usage of MOS; 2.9 Conclusion on speech-coding techniques and their near future
2.9.1 The race for low-bitrate coders2.9.2 Optimization of source encoding and channel encoding; 2.9.3 The future; 2.10 References; 2.10.1 Articles; 2.10.2 Books; 2.11 Annexes; 2.11.1 Main characteristics of ITU-T standardized speech coders; 2.11.2 Main characteristics of cellular mobile standardized speech coders; 3 Voice Quality; 3.1 Introduction; 3.2 Reference VoIP media path; 3.3 Echo in a telephone network; 3.3.1 Talker echo, listener echo; 3.3.2 Electric echo; 3.3.3 Acoustic echo; 3.3.4 How to limit echo; 3.4 Delay; 3.4.1 Influence of the operating system
3.4.2 The influence of the jitter buffer policy on delay
Record Nr. UNINA-9910143578103321
Hersent Olivier  
Hoboken, NJ, : John Wiley, 2005
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui